Produced in 1:8 scale, the Formula One racing tyres in this set feature a realistic and tactile rubber surface. Each wheel is replicated in exact detail, weighs 500 gm (15 oz.) and measures 8 cm (3.2”) by 4.5 cm (1.8”). They are ideal for use as paperweights. The Formula wheel pen set contains two wheels with red and blue aluminium ball-point pens placed in the wheels’ centre holes, the tips resembling the blue and red wheel lock nuts that signify the left and right thread nuts of a Formula One car’s wheels.Diameter: 8.1cm